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Small Desk Lamp – A desk lamp is a useful tool for both working with electronics or simply reading on your desk. LEDs save a lot of energy and together they provide more than acceptable lighting. For this project, a 12V DC power supply is used. Instead of adding a series resistor for each LED, the most efficient way to power them from 12V DC is to connect them in series in groups of three. This means that you need 10V DC for each set. But how to get 10V from a 12V source? One way to do this is by pulse width modulation (PWM). A current of pulses is sent, too fast for the eye to see, and the spaces between these pulses are varied to limit the average current.
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